Porometer POROLUX BP Bubble Point Pore Size Analyzer

Overview

The Porometer POROLUX BP Bubble Point Pore Size Analyzer is a precision-engineered capillary flow porometer designed for the quantitative determination of the largest effective pore (i.e., the “bubble point”) in porous materials used in filtration, separation, and barrier applications. Based on the fundamental principle of liquid displacement under controlled gas pressure—where a wetting liquid (typically isopropyl alcohol or water) is retained in pores by surface tension until the applied gas pressure exceeds the capillary entry pressure—the POROLUX BP delivers traceable, reproducible bubble point values aligned with internationally recognized standards including ASTM F316-22 (Standard Test Methods for Pore Size Characteristics of Membrane Filters by Bubble Point and Forward Flow), ISO 4003 (Determination of the largest pore in a filter membrane), and USP (Bubble Point Test for Sterile Filtration Integrity). Unlike multi-mode instruments, the POROLUX BP is purpose-built for bubble point measurement only, eliminating complexity while maximizing operational robustness and measurement repeatability across production QC and R&D environments.

Key Features

• Dedicated bubble point architecture: Optimized exclusively for high-fidelity bubble point detection—no compromise from hybrid functionality.
• Wide dynamic pressure range: Precisely regulated gas pressure control from 0 to 5 bar (0–75 psi) with ±0.01 bar resolution, enabling accurate characterization of both coarse and ultrafine porous structures.
• Sub-micron sensitivity: Capable of detecting bubble points corresponding to nominal pore diameters as small as 0.13 µm, validated against NIST-traceable reference membranes.
• Two standardized bubble point reporting modes: BP dPL (deviation from linear pressure increase) and BP x-ml (bubble point measured at a user-defined gas flow rate), both fully compliant with ASTM F316 Annex A2 and A3 protocols.
• Integrated temperature-compensated pressure transducers and mass flow sensors ensure long-term stability and minimal drift over extended test sequences.
• Compact benchtop footprint (W × D × H: 320 × 380 × 220 mm) with CE-marked electrical safety and IP42-rated enclosure for laboratory and cleanroom-adjacent use.

Sample Compatibility & Compliance

The POROLUX BP accommodates a broad spectrum of flat-sheet and tubular porous substrates without requiring custom fixtures. Compatible sample formats include: polymeric flat-sheet membranes (e.g., PVDF, PTFE, nylon, cellulose esters), hollow fiber modules (with optional holder), nonwovens and technical textiles, ceramic discs and monoliths, sintered metal filters (stainless steel, bronze, titanium), and specialty papers (e.g., battery separators, food-grade packaging liners). All measurements adhere to GLP-aligned documentation practices: each test record includes timestamp, operator ID, sample ID, wetting fluid type, temperature, pressure ramp profile, raw dP/dt curves, and final BP value—all stored with immutable digital signatures. The system supports audit-ready compliance with FDA 21 CFR Part 11 requirements when deployed with POROLUX Control Suite’s role-based access control and electronic signature modules.

Software & Data Management

POROLUX Control Suite v3.x is a Windows-based application engineered for traceability and regulatory readiness. It provides real-time visualization of pressure vs. time and flow vs. pressure curves, automatic BP threshold detection using dual-algorithm validation (tangent intersection + inflection point), and batch reporting with customizable templates (PDF, CSV, Excel). Data integrity safeguards include encrypted local database storage, configurable auto-backup to network drives, and full audit trail logging of all user actions—including method edits, result overrides, and calibration events. Exported reports embed metadata required for ISO/IEC 17025 accreditation and internal quality audits.

Applications

• Quality assurance of sterilizing-grade membrane filters prior to release (e.g., 0.22 µm and 0.1 µm rated filters).
• R&D screening of novel membrane formulations during solvent-cast or phase-inversion development.
• Batch-to-batch consistency verification of sintered metal frits used in pharmaceutical processing equipment.
• Pore structure validation of battery separator films for lithium-ion cell manufacturing.
• Integrity testing of hydrophobic/hydrophilic air vent filters in bioreactor and filling line applications.
• Comparative analysis of pore size distribution shifts induced by thermal aging, chemical exposure, or mechanical compression.

FAQ

What wetting liquids are supported—and how do I select one?
The POROLUX BP is validated for use with isopropyl alcohol (IPA), ethanol, and purified water. Selection depends on material compatibility and target pore size: IPA (surface tension ~23 mN/m) is standard for sub-1 µm pores; water (~72 mN/m) is preferred for coarse ceramics or metals where higher entry pressures improve signal-to-noise ratio.
Can the POROLUX BP measure pore size distribution?
No—this instrument performs single-point bubble point determination only. For full pore size distribution (PSD) analysis, consider the POROLUX 1000 series, which implements full capillary flow porometry (CFP) with dry/wet flow scans.
Is calibration traceable to national standards?
Yes—pressure transducers are calibrated annually against a Fluke 754 Documenting Process Calibrator, certified to ISO/IEC 17025 by an accredited third-party lab. Calibration certificates include as-found/as-left data and uncertainty budgets.
Does the system support automated pass/fail decision logic?
Yes—user-defined specification limits can be embedded into test methods. The software automatically flags results outside tolerance and generates non-conformance alerts with root-cause tagging fields.
What maintenance is required for routine operation?
Daily: Visual inspection of O-rings and sample seal integrity. Weekly: Purge gas lines with dry nitrogen; verify wetting fluid level. Annually: Full sensor recalibration and firmware update via Porometer Technical Support portal.